<?php
/**
 * PHPExcel
 *
 * Copyright (c) 2006 - 2011 PHPExcel
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * @category    PHPExcel
 * @package        PHPExcel_Calculation
 * @copyright    Copyright (c) 2006 - 2011 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license        http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
 * @version        1.7.6, 2011-02-27
 */


/** PHPExcel root directory */
if (!defined('PHPEXCEL_ROOT')) {
    /**
     * @ignore
     */
    define('PHPEXCEL_ROOT', dirname(__FILE__) . '/../../');
    require(PHPEXCEL_ROOT . 'PHPExcel/Autoloader.php');
}


/**
 * PHPExcel_Calculation_Database
 *
 * @category    PHPExcel
 * @package        PHPExcel_Calculation
 * @copyright    Copyright (c) 2006 - 2011 PHPExcel (http://www.codeplex.com/PHPExcel)
 */
class PHPExcel_Calculation_Database {


    private static function __fieldExtract($database,$field) {
        $field = strtoupper(PHPExcel_Calculation_Functions::flattenSingleValue($field));
        $fieldNames = array_map('strtoupper',array_shift($database));

        if (is_numeric($field)) {
            $keys = array_keys($fieldNames);
            return $keys[$field-1];
        }
        $key = array_search($field,$fieldNames);
        return ($key) ? $key : null;
    }

    private static function __filter($database,$criteria) {
        $fieldNames = array_shift($database);
        $criteriaNames = array_shift($criteria);

        //    Convert the criteria into a set of AND/OR conditions with [:placeholders]
        $testConditions = $testValues = array();
        $testConditionsCount = 0;
        foreach($criteriaNames as $key => $criteriaName) {
            $testCondition = array();
            $testConditionCount = 0;
            foreach($criteria as $row => $criterion) {
                if ($criterion[$key] > '') {
                    $testCondition[] = '[:'.$criteriaName.']'.PHPExcel_Calculation_Functions::_ifCondition($criterion[$key]);
                    $testConditionCount++;
                }
            }
            if ($testConditionCount > 1) {
                $testConditions[] = 'OR('.implode(',',$testCondition).')';
                $testConditionsCount++;
            } elseif($testConditionCount == 1) {
                $testConditions[] = $testCondition[0];
                $testConditionsCount++;
            }
        }
        if ($testConditionsCount > 1) {
            $testConditionSet = 'AND('.implode(',',$testConditions).')';
        } elseif($testConditionsCount == 1) {
            $testConditionSet = $testConditions[0];
        }

        //    Loop through each row of the database
        foreach($database as $dataRow => $dataValues) {
            //    Substitute actual values from the database row for our [:placeholders]
            $testConditionList = $testConditionSet;
            foreach($criteriaNames as $key => $criteriaName) {
                $k = array_search($criteriaName,$fieldNames);
                if (isset($dataValues[$k])) {
                    $dataValue = $dataValues[$k];
                    $dataValue = (is_string($dataValue)) ? PHPExcel_Calculation::_wrapResult(strtoupper($dataValue)) : $dataValue;
                    $testConditionList = str_replace('[:'.$criteriaName.']',$dataValue,$testConditionList);
                }
            }
            //    evaluate the criteria against the row data
            $result = PHPExcel_Calculation::getInstance()->_calculateFormulaValue('='.$testConditionList);
            //    If the row failed to meet the criteria, remove it from the database
            if (!$result) {
                unset($database[$dataRow]);
            }
        }

        return $database;
    }


    /**
     *    DAVERAGE
     *
     */
    public static function DAVERAGE($database,$field,$criteria) {
        $field = self::__fieldExtract($database,$field);
        if (is_null($field)) {
            return NULL;
        }

        //    reduce the database to a set of rows that match all the criteria
        $database = self::__filter($database,$criteria);
        //    extract an array of values for the requested column
        $colData = array();
        foreach($database as $row) {
            $colData[] = $row[$field];
        }

        // Return
        return PHPExcel_Calculation_Statistical::AVERAGE($colData);
    }    //    function DAVERAGE()

    /**
     *    DCOUNT
     *
     */
    public static function DCOUNT($database,$field,$criteria) {
        $field = self::__fieldExtract($database,$field);
        if (is_null($field)) {
            return NULL;
        }

        //    reduce the database to a set of rows that match all the criteria
        $database = self::__filter($database,$criteria);
        //    extract an array of values for the requested column
        $colData = array();
        foreach($database as $row) {
            $colData[] = $row[$field];
        }

        // Return
        return PHPExcel_Calculation_Statistical::COUNT($colData);
    }    //    function DCOUNT()

    /**
     *    DCOUNTA
     *
     */
    public static function DCOUNTA($database,$field,$criteria) {
        $field = self::__fieldExtract($database,$field);
        if (is_null($field)) {
            return NULL;
        }

        //    reduce the database to a set of rows that match all the criteria
        $database = self::__filter($database,$criteria);
        //    extract an array of values for the requested column
        $colData = array();
        foreach($database as $row) {
            $colData[] = $row[$field];
        }

        // Return
        return PHPExcel_Calculation_Statistical::COUNTA($colData);
    }    //    function DCOUNTA()

    /**
     *    DGET
     *
     */
    public static function DGET($database,$field,$criteria) {
        $field = self::__fieldExtract($database,$field);
        if (is_null($field)) {
            return NULL;
        }

        //    reduce the database to a set of rows that match all the criteria
        $database = self::__filter($database,$criteria);
        //    extract an array of values for the requested column
        $colData = array();
        foreach($database as $row) {
            $colData[] = $row[$field];
        }

        // Return
        if (count($colData) > 1) {
            return PHPExcel_Calculation_Functions::NaN();
        }

        return $colData[0];
    }    //    function DGET()

    /**
     *    DMAX
     *
     */
    public static function DMAX($database,$field,$criteria) {
        $field = self::__fieldExtract($database,$field);
        if (is_null($field)) {
            return NULL;
        }

        //    reduce the database to a set of rows that match all the criteria
        $database = self::__filter($database,$criteria);
        //    extract an array of values for the requested column
        $colData = array();
        foreach($database as $row) {
            $colData[] = $row[$field];
        }

        // Return
        return PHPExcel_Calculation_Statistical::MAX($colData);
    }    //    function DMAX()

    /**
     *    DMIN
     *
     */
    public static function DMIN($database,$field,$criteria) {
        $field = self::__fieldExtract($database,$field);
        if (is_null($field)) {
            return NULL;
        }

        //    reduce the database to a set of rows that match all the criteria
        $database = self::__filter($database,$criteria);
        //    extract an array of values for the requested column
        $colData = array();
        foreach($database as $row) {
            $colData[] = $row[$field];
        }

        // Return
        return PHPExcel_Calculation_Statistical::MIN($colData);
    }    //    function DMIN()

    /**
     *    DPRODUCT
     *
     */
    public static function DPRODUCT($database,$field,$criteria) {
        $field = self::__fieldExtract($database,$field);
        if (is_null($field)) {
            return NULL;
        }

        //    reduce the database to a set of rows that match all the criteria
        $database = self::__filter($database,$criteria);
        //    extract an array of values for the requested column
        $colData = array();
        foreach($database as $row) {
            $colData[] = $row[$field];
        }

        // Return
        return PHPExcel_Calculation_MathTrig::PRODUCT($colData);
    }    //    function DPRODUCT()

    /**
     *    DSTDEV
     *
     */
    public static function DSTDEV($database,$field,$criteria) {
        $field = self::__fieldExtract($database,$field);
        if (is_null($field)) {
            return NULL;
        }

        //    reduce the database to a set of rows that match all the criteria
        $database = self::__filter($database,$criteria);
        //    extract an array of values for the requested column
        $colData = array();
        foreach($database as $row) {
            $colData[] = $row[$field];
        }

        // Return
        return PHPExcel_Calculation_Statistical::STDEV($colData);
    }    //    function DSTDEV()

    /**
     *    DSTDEVP
     *
     */
    public static function DSTDEVP($database,$field,$criteria) {
        $field = self::__fieldExtract($database,$field);
        if (is_null($field)) {
            return NULL;
        }

        //    reduce the database to a set of rows that match all the criteria
        $database = self::__filter($database,$criteria);
        //    extract an array of values for the requested column
        $colData = array();
        foreach($database as $row) {
            $colData[] = $row[$field];
        }

        // Return
        return PHPExcel_Calculation_Statistical::STDEVP($colData);
    }    //    function DSTDEVP()

    /**
     *    DSUM
     *
     */
    public static function DSUM($database,$field,$criteria) {
        $field = self::__fieldExtract($database,$field);
        if (is_null($field)) {
            return NULL;
        }

        //    reduce the database to a set of rows that match all the criteria
        $database = self::__filter($database,$criteria);
        //    extract an array of values for the requested column
        $colData = array();
        foreach($database as $row) {
            $colData[] = $row[$field];
        }

        // Return
        return PHPExcel_Calculation_MathTrig::SUM($colData);
    }    //    function DSUM()

    /**
     *    DVAR
     *
     */
    public static function DVAR($database,$field,$criteria) {
        $field = self::__fieldExtract($database,$field);
        if (is_null($field)) {
            return NULL;
        }

        //    reduce the database to a set of rows that match all the criteria
        $database = self::__filter($database,$criteria);
        //    extract an array of values for the requested column
        $colData = array();
        foreach($database as $row) {
            $colData[] = $row[$field];
        }

        // Return
        return PHPExcel_Calculation_Statistical::VARFunc($colData);
    }    //    function DVAR()

    /**
     *    DVARP
     *
     */
    public static function DVARP($database,$field,$criteria) {
        $field = self::__fieldExtract($database,$field);
        if (is_null($field)) {
            return NULL;
        }

        //    reduce the database to a set of rows that match all the criteria
        $database = self::__filter($database,$criteria);
        //    extract an array of values for the requested column
        $colData = array();
        foreach($database as $row) {
            $colData[] = $row[$field];
        }

        // Return
        return PHPExcel_Calculation_Statistical::VARP($colData);
    }    //    function DVARP()


}    //    class PHPExcel_Calculation_Database
